1.Definition: (phonetics) an individual sound unit of speech without concern as to whether or not it is a phoneme of some language

Related Noun(s):sound

Category: General

2.Definition: electro-acoustic transducer for converting electric signals into sounds; it is held over or inserted into the ear

"It was not the typing but the earphones that she disliked"

Related Noun(s):earphone, earpiece, headphone

Category: Objects

3.Definition: electronic equipment that converts sound into electrical signals that can be transmitted over distances and then converts received signals back into sounds

"I talked to him on the telephone"

Related Noun(s):telephone

Category: Objects